20871812662 has 32 divisors (see below), whose sum is σ = 34323613920. Its totient is φ = 9474716160.

The previous prime is 20871812659. The next prime is 20871812693. The reversal of 20871812662 is 26621817802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1145568 + ... + 1163644.

It is an arithmetic number, because the mean of its divisors is an integer number (1072612935).

Almost surely, 2^20871812662 is an apocalyptic number.

20871812662 is a deficient number, since it is larger than the sum of its proper divisors (13451801258).

20871812662 is a wasteful number, since it uses less digits than its factorization.

20871812662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19296.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 20871812662 in words is "twenty billion, eight hundred seventy-one million, eight hundred twelve thousand, six hundred sixty-two".